Just on the off chance you could try asking the "Worker's health and safety insurance board of Ontario" if that's still its name. They'll have a website. They're very happy to provide this type of information (if they have it).
Hi Christopher, thank you so much! I'll give it a try, I'm also contacting the EU Study Group, SCENIHR - Scientific Committee on Emerging and Newly Identified Health Risks/Health effects of artificial light, but the more things have already come to evidence status, the better. I do hope they have some data on the subject. Thanks again, all the bests